The story of "tiny Tim," the son of his poor employee.
It is important because the sources tell you whether the article was credible. When you have an article that has bad source, you are running the risk of having, wrong, opinionated data. This can discredit you paper if you use it.
first one is (MAIN CLAUSE)
second one is (SUBORDINATING CLAUSE)
but i am not sure about the 3rd one
the second option is the correct answer